This story has a lot of components. As a writer, my advice to you is to pick one section of the overall story, then tell that small section well while attempting to build enough of the backstory into it so that it makes sense. Think of it as putting a small window against a large painting: you want to find part of the painting that will look interesting in it’s own right through the window, while suggesting that there is even more outside the viewport that fits.
You will have to do this especially if you plan to even animate.
Also, you should learn screenplay format.
Almost no story inherently “sucks”. It’s what you do with it that matters.
Questions that make me wonder if you were high while conceptualizing this, though: why a wrestler? where do the goddesses come from and why are they needed in this story?
Personally, I think a better approach to this would be:
Fade in on man crawling into the sewers, trying to escape from something. In the background, we see a devastated cityscape. Label on screen reads: “5 weeks into armageddon”. Voice over narration to the effect of: “I remember a time when I didn’t have to prowl the sewers for food. I remember a time before Dr. XXXX turned his robots loose on us. I remember a time when professional wrestlers like me weren’t hunted down like the lowest of dogs. Why did he do it? Why did he try to destroy us allaaaaaa!”
The crawling guy falls through a whole in the sewer tunnel floor, finding himself in a pristine chamber. When he looks up, he sees the awesome robot labeled “GODBUNNY” standing before him, waiting for a driver. Not understanding where it came from, he nonetheless recognizes its potential for combat.
From there, he interacts with the GB computer personality to learn where it came from, etc., and uses GB to begin to fight back against the Drs. evil robots. Of course, GB will get it’s butt kicked until it learns to use wrestling moves…
This way, your reader/viewer is immediately involved with the guy running away from something dangerous an unseen. Also, they should perhaps be amused that pro wrestlers seem to be singled out for extermination. Then, there is the mystery of a powerful artifact. Most of the elements you had initially still fit, but constraining your window (this is called the “subjective story”) can make it a much more entertaining experience.